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99mTc-radiolabeled HER2 targeted exosome for tumor imaging.
European Journal of Pharmaceutical Sciences ( IF 4.3 ) Pub Date : 2020-03-17 , DOI: 10.1016/j.ejps.2020.105312
Sajjad Molavipordanjani 1 , Shabanali Khodashenas 2 , Seyed Mohammad Abedi 3 , Mehdi Forouzandeh Moghadam 4 , Alireza Mardanshahi 3 , Seyed Jalal Hosseinimehr 5
Affiliation  

Exosomes represent unique features including nontoxicity, non-immunogenicity, biodegradability, and targeting ability that make them suitable candidates for clinical applications. Therefore, in this study, 99mTc-radiolabel HER2 targeted exosomes (99mTc-exosomes) were provided for tumor imaging. These exomes are obtained from genetically engineered cells and possessed DARPin G3 as a ligand for HER2 receptors. These exosomes were radiolabeled using fac-[99mTc(CO)3(H2O)3]+ synthon. The quality control showed high radiochemical purity (RCP) for 99mTc-exosomes (>96%). 99mTc-exosomes displayed a higher affinity toward SKOV-3 cells (higher HER2 expression) in comparison with MCF-7, HT29, U87-MG, A549 cell lines at different levels of HER2 expression. Trastuzumab (an antibody with a high affinity toward HER2) inhibited the binding of 99mTc-exosomes to SKOV-3 cells up to 40%. Biodistribution study in SKOV-3 tumor bearing nude mice confirmed the ability of 99mTc-exosomes for accumulation in the tumor. 99mTc-exosomes can visualize tumor in SKOV-3 tumor-bearing nude mouse. The blockage of HER2 receptors using trastuzumab (excessive amount) suggests the 99mTc-exosomes binding to the receptors and reduced the accumulation of 99mTc-exosomes in the tumor site. This suggest that 99mTc-exosomes interact with HER2 receptors and act through specific targeting.

中文翻译:

99mTc放射性标记的HER2靶向外泌体用于肿瘤成像。

外泌体具有独特的功能,包括无毒,无免疫原性,生物降解性和靶向能力,使其成为临床应用的合适候选者。因此,在这项研究中,提供了99mTc-放射性标记的HER2靶向外泌体(99mTc-外泌体)进行肿瘤成像。这些外显子组获自基因工程细胞,并具有DARPin G3作为HER2受体的配体。使用fac- [99mTc(CO)3(H2O)3] +合成子对这些外泌体进行放射性标记。质量控制显示99mTc外泌体的放射化学纯度(RCP)高(> 96%)。与在不同HER2表达水平的MCF-7,HT29,U87-MG,A549细胞系相比,99mTc外泌体对SKOV-3细胞显示出更高的亲和力(HER2表达更高)。曲妥珠单抗(一种对HER2具有高度亲和力的抗体)抑制99mTc外泌体与SKOV-3细胞的结合达到40%。在携带SKOV-3肿瘤的裸鼠中进行的生物分布研究证实了99mTc-外泌体在肿瘤中蓄积的能力。99mTc外泌体可以使SKOV-3荷瘤裸鼠中的肿瘤可视化。使用曲妥珠单抗(过量)对HER2受体的阻断表明99mTc-外泌体与受体结合,并减少了99mTc-外泌体在肿瘤部位的蓄积。这表明99mTc外泌体与HER2受体相互作用并通过特异性靶向发挥作用。使用曲妥珠单抗(过量)对HER2受体的阻断表明99mTc-外泌体与受体结合,并减少了99mTc-外泌体在肿瘤部位的蓄积。这表明99mTc外泌体与HER2受体相互作用,并通过特异性靶向发挥作用。使用曲妥珠单抗(过量)对HER2受体的阻断表明99mTc-外泌体与受体结合,并减少了99mTc-外泌体在肿瘤部位的蓄积。这表明99mTc外泌体与HER2受体相互作用,并通过特异性靶向发挥作用。
更新日期:2020-03-19
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